A search for Cepheids in NGC 5584 using Difference Image Analysis

Details A search for Cepheids in NGC 5584 using Difference Image Analysis A search for Cepheids in NGC 5584 using Difference Image Analysis

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934815h&link_type=abstract

American Astronomical Society, AAS Meeting #219, #348.15

Computer Science

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Scientific paper

A more precise and accurate measurement of the Hubble constant (H0) via Cepheids and type Ia supernovae imposes significant additional constraints on the equation of state of dark energy. We recently carried out a search for Cepheids in NGC 5584, host of the type Ia supernova 2007af, as part of an ongoing program to determine H0 with a total uncertainty below 3%.
We surveyed NGC 5584 with HST/WFC3 over 13 epochs spanning 100 days. We searched for Cepheids using point-spread function (PSF) and difference image analysis (DIA) techniques. We present the samples of Cepheid candidates found with each method and compare their performance for finding Cepheids in crowded fields.
We acknowledge support by NASA through grant HST-GO-11570.

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